Malware
Malicious software designed to damage, disrupt, or gain unauthorised access to computer systems, including viruses, worms, trojans, ransomware, spyware, and adware.
In-Depth Explanation
Malware (malicious software) is any software intentionally designed to cause harm to a computer, server, network, or user. It is an umbrella term covering a wide range of hostile programs that can steal data, damage systems, or provide unauthorised access.
Types of malware:
- Virus: Self-replicating code that attaches to legitimate programs
- Worm: Self-propagating malware that spreads across networks without user interaction
- Trojan: Disguised as legitimate software to trick users into installation
- Ransomware: Encrypts data and demands payment for decryption
- Spyware: Secretly monitors user activity and collects information
- Adware: Displays unwanted advertisements, often bundled with free software
- Rootkit: Hides deep within the operating system to maintain persistent access
- Fileless malware: Operates in memory without writing files to disk
- Botnet malware: Turns infected devices into remotely controlled bots
Common infection vectors:
- Phishing emails with malicious attachments or links
- Drive-by downloads from compromised websites
- Infected USB drives or removable media
- Pirated software and cracked applications
- Exploitation of unpatched software vulnerabilities
- Malicious advertisements (malvertising)
- Supply chain compromise of legitimate software updates
Malware defence layers:
- Email security filtering (block malicious attachments and links)
- Endpoint detection and response (EDR)
- DNS filtering (block malicious domains)
- Regular patching and software updates
- User security awareness training
- Application control (whitelist approved software)
- Network segmentation to limit spread
Business Context
Malware infections cost Australian businesses millions annually through data theft, system downtime, remediation costs, and reputational damage. A layered defence approach combining multiple controls is essential as no single tool can catch all malware.
How Clever Ops Uses This
Clever Ops implements multi-layered malware defence for Australian businesses including EDR solutions, email security, DNS filtering, patch management, and security awareness training. We design defence-in-depth architectures that detect and block malware at multiple stages of the attack chain.
Example Use Case
"An Australian business blocks a malware attack at three layers: email filtering quarantines the phishing email, DNS filtering blocks the malicious download URL when an employee clicks a similar link, and EDR detects and isolates the threat when a variant reaches an endpoint."